"Really and Sincerely" is a song by the Bee Gees. Written by Barry, Robin & Maurice Gibb in 1967 and released in 1968 on the album Horizontal, it is also featured as the B-side of "And the Sun Will Shine" in France. It was issued in 1970 as the B-side single to "Let There Be Love". According to Bruce Eder of Allmusic, "the song descends into an even more emotionally melodramatic mood than "And the Sun Will Shine"".